What way should I go...

[Ruth]

How old is your live rock Mike? It might be that the nitrates are being stored in the LR and being released. I know that I have read about that happening with old LR.
You might want to consider weekly water changes of 30-40% until they come down a bit more.
I know that when my nitrates have been high on my now FOWLR and anemone tank I was loosing SPS corals too. The heat and no skimmer finished them off and with the fish load in this tank I just decided not to add any more corals.